I think the overall housing is the same, but I am not 100%. This would apply only to the ZJ grand not the later WJ. I do know the grands have a different axle joint, they have a CV joint vs a U-joint. Supposedly not as strong but lots smoother when turned tight. I also believe they are low pinion vs the high pinion on the XJ(only up to 99 or 00 after that they went low pinion.

I would guess the front driveshaft to be different.